Superparamagnetism in small Fe clusters on Cu(111)
Max-Planck-Instut für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart, Germany
Corresponding author: a email@example.com
Revised: 23 July 2007
Published online: 26 September 2007
Fe clusters of 105±2 atoms/cluster were mass selectively deposited onto Cu(111) at cryogenic temperatures. XMCD was used to measure temperature and direction dependent magnetization curves. The clusters are superparamagnetic at the lowest temperature measured (10 K). Their magnetization curves are consistent with magnetic moments of ≈2.5μB per atom which are thus enhanced over the bulk values. Within experimental accuracy, the clusters do not present magnetocrystalline anisotropy in the temperature range of 10 K to 60 K.
PACS: 36.40.Cg – Electronic and magnetic properties of clusters / 36.20.Kd – Electronic structure and spectra / 73.22.-f – Electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals / 75.75.+a – Magnetic properties of nanostructures / 78.67.Bf – Nanocrystals and nanoparticles
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2007